Headlamp: The primary light source consists of a 6-volt headlamp mounte don the front of the fatigue cap. A bite-type on-off switch turns the light on and off.
Communication system: A highly sensitive bone conductor microphone may be attached to the inside top of the fatigue cap, work on the bone in back of the head, or strapped around the throat. Reception is provided by an earpiece. Lead terminals from the trailing wire are secured to the pistol belt near a wire reel which is attached to the belt. The system may be used with the TA312/PT telephone or another bone conductor system.
Revolver: A .38 caliber, 4-inch barrel revolver is provided with each kit. A silencer and a small high intensity aiming light is mounted on the weapon. Ear valves are provided to protect the user's ears when the weapon is fired.
The bite switch for the headlamp didn't function properly
The weight of the headlamp and rubbing against the tunnel roof cause the hat to slide down over the user's eyes, especially after the user began to sweat. The headlamp also made it difficult to point the light beam where necessary when a tunnel changed direction, and the hat brim could block a portion of the lamp's light.
Users had trouble keeping the earpiece for the comms system in place and the wires were easy to snag on...pretty much anything. For the comms system to be of any use, it had to be hardwired to a field telephone via a reel of comms wire that had to be carried on the gunbelt and trailed behind the user.